Flatpak's process ID namespace separation does not prevent a sandboxed app's kill(0, signal) or killpg(0, signal) calls from reaching processes outside the sandbox that share the same process group. A malicious or compromised Flatpak app can use this to cause denial of service by terminating processes outside its sandbox, such as the desktop shell.
CVE-2026-97029
MEDIUMPre-NVD 5.75.7—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 5.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (14th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.7Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 5.7
- EG Score
- 5.7MEDIUMmedium confidence
- EG Risk
- 26EG Risk 26/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity57% × 45%Exploitation0% × 40%Automatability0% × 15%CISA SSVC: Track at every mission impact level.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.2%
- EPSS %ILE
- 14th
- KEV
- Not listed
CISA SSVCTrack at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
September 29, 2026
Last Modified
September 29, 2026
Advisory Details (3)
Auto-updated Sep 29, 2026Patch available. Sources: redhat, github.
github Patch Available
CVE-2026-97029: Sandboxed app can signal unsandboxed processes in the same process group · Advisory · flatpak/flatpak · GitHub
Affected: 1.18.4 by:
https://github.com/flatpak/flatpak/security/advisories/GHSA-f3p8-vr7v-gxf2redhat
2542698 – (CVE-2026-97029) CVE-2026-97029 flatpak: flatpak: Sandboxed app can signal unsandboxed processes in the same process group
https://bugzilla.redhat.com/show_bug.cgi?id=2542698redhat Patch Available
CVE-2026-97029 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a
https://access.redhat.com/security/cve/CVE-2026-97029Affected Packages
(3 across 3 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| flatpak | 1.14.10-1 ... 1.18.4-1 (53 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| flatpak | 1.16.1-1 ... 1.16.6-1~deb13u2 (13 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| flatpak | 1.16.1-1 ... 1.18.3-1 (23 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 14× in last 7d / 14× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-04 23:23 UTCEPSS rescore
- 2026-10-03 20:44 UTCEG score recompute
- 2026-10-03 14:26 UTCEPSS rescore
- 2026-10-02 21:06 UTCEG score recompute
- 2026-10-02 17:57 UTCEPSS rescore
- 2026-10-01 21:24 UTCEG score recompute
- 2026-10-01 19:51 UTCEPSS rescore
- 2026-09-30 21:47 UTCEG score recompute
- 2026-09-30 15:04 UTCEPSS rescore
- 2026-09-29 16:40 UTCEG score recompute
- 2026-09-29 15:58 UTCEG score recompute
- 2026-09-29 04:31 UTCEG score recompute
- 2026-09-29 03:58 UTCEG score recompute
- 2026-09-29 03:55 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-97029?
CVE-2026-97029 is a medium vulnerability published on September 29, 2026. Flatpak's process ID namespace separation does not prevent a sandboxed app's kill(0, signal) or killpg(0, signal) calls from reaching processes outside the sandbox that share the same process group. A malicious or compromised Flatpak app can use this to cause denial of service by terminating…
When was CVE-2026-97029 disclosed?
CVE-2026-97029 was first published on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-97029 actively exploited?
CVE-2026-97029 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (14th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-97029?
CVE-2026-97029 has a CVSS base score of 5.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-97029?
A fix for CVE-2026-97029 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-97029
Is Your Infrastructure Affected by CVE-2026-97029?
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